Read File by extension from memory in android

private static void searchFolderRecursive1(File folder) {
    if (folder != null) {
        if (folder.listFiles() != null) {
            for (File file : folder.listFiles()) {
                if (file.isFile()) {
                    if(file.getName().contains("file extension")){
                        Log.v("ooo", "path__="+file.getName());
                    }
                } else {
                    searchFolderRecursive1(file);
                }
            }
        }
    }
}

Play Audio fron url or Server in android

try {
                MediaPlayer player = new MediaPlayer();
                player.setAudioStreamType(AudioManager.STREAM_MUSIC);
                player.setDataSource("server mp3 link" );
                player.prepare();
                            player.start();

            } catch (Exception e) {
                // TODO: handle exception
            }

What is push massage Service in Android (Cloud to device messaging )

Most mobile apps require data from the Internet. One approach for updating its data is that the apps periodically polls a server for new data (Polling). If no new data is available this approach uses unnecessary network bandwidth and consumes the battery of the mobile phone.
An alternative approach is that the server contacts the mobile app once new data is available (Push). If the data does not change constantly, Push is the preferred solution. 

As of Android 2.2 it is possible to push information to an Android app. This service is called Cloud to Device messaging or short C2DM.
In a C2DM you have three involved parties. The application server which wants to push messages to the Android device, Googles C2DM servers and the Android app. The program on the application server can be written in any programming language, e.g. Java, PHP, Python, etc.
When the application server needs to push a message to the Android application, it sends the message via an HTTP POST to Google’s C2DM servers.
The C2DM servers route the message to the device. If the device is not online, the message will be delivered once the device is available. Once the message is received, an Broadcast Intent is created. The mobile app has registered an Intent Receiver for this Broadcast. The app is started and processes the message via the defined Intent Receiver.
C2DM messages are limited in size to 1024 bytes and are intended to inform the device about new data not to transfer it. The typical workflow is that Googles C2DM servers notify the Android app that new data is available. Afterwards the Android app fetches the data from a different server.

Display Text on User Define Path on android canvas

Path circle = new Path();
circle.addCircle(centerX, centerY, radius, Direction.CW);
// set the color and font size
Paint paint = new Paint();
paint.setColor(Color.BLUE);
paint.setTextSize(30);
paint.setAntiAlias(true);
// draw the text along the circle
canvas.drawTextOnPath(QUOTE, circle, 0, 30, paint);

Convert milliseconds to HH:MM:SS String in java

1. long timeMillis = ...;  
2. long time = timeMillis / 1000;  
3. String seconds = Integer.toString((int)(time % 60));  
4. String minutes = Integer.toString((int)((time % 3600) / 60));  
5. String hours = Integer.toString((int)(time / 3600));  
6. for (int i = 0; i < 2; i++) {  
7. if (seconds.length() < 2) {  
8. seconds = "0" + seconds;  
9. }  
10. if (minutes.length() < 2) {  
11. minutes = "0" + minutes;  
12. }  
13. if (hours.length() < 2) {  
14. hours = "0" + hours;  
15. }  
16. }